installation and commissioning of license plate recognition system < / a >

I. two angles of attention during installation

　　1. The angle between the incoming direction and the lane edge should not exceed 40 degrees. Obstacles can be set at the lane edge to guide the owner to straighten the front of the car early. If the angle is too large or cars come from multiple directions, you may need to change the position of the pole or add a camera

　　2. Look at the close-up of the license plate in the simplified interface. The included angle between the long side of the license plate and the bottom of the frame should not exceed 30 degrees. If it is too large, please adjust the universal joint. After adjustment, it is generally higher than half of the lane

II. Identification area and trigger line correlation

　　1. 150-160 pixels are recommended at the capture position, which is equivalent to the width managed at the capture position of about 5.5m (1.5 times the width of ordinary Lane), which can be met by adjusting the zoom of the lens

　　2. The pixel points on the upper edge of the recognition area should not be less than 100, that is, the range framed by the recognition area should not be too far away, which is prone to error

　　3. Don't mark the identification area close to the lane line, but pay more attention to the license plate. Make sure that the license plate is framed into the identification area, otherwise it may leak